声靶中的信号处理技术研究
文献类型：学位论文
| 作者 | 欧光艳 |
| 学位类别 | 博士 |
| 答辩日期 | 2008-05-30 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 声学研究所 |
| 关键词 | 声靶 精确测频技术 异步采样率变换技术 分布式算法 伪随机码 |
| 其他题名 | the Researching on the Technology for Processing Signal in Acoustics Target |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 声靶是鱼雷声引信试验、鉴定必需的固定靶标设备，其主要任务是模拟潜艇的噪声辐射特性和声学反射特性，为鱼雷的声引信海上实验提供固定靶标，考核鱼雷声引信的战术指标性能。 本课题的声靶不仅要具备考核鱼雷声引信的功能，而且必须与鱼雷自导靶相结合才能动态地、实时地考核鱼雷声引信的功能。该声靶集成了声引信、声自导和雷靶检测功能，它可以独立地实时考核鱼雷声自导功能，引导鱼雷攻击本靶。在鱼雷攻击阶段，转发鱼雷声引信信号，使鱼雷声引信动作。它也可以将声引信部分和雷靶检测装置的水下电子模块安装到其他后续型号的鱼雷固定靶水下电子舱内，用于考核其他后续型号的鱼雷声引信。 本论文的任务就是对声靶中的信号处理的关键技术进行研究。本论文所采用的信号处理的关键技术有：（1）基于谱线比值法的精确测频技术，该技术能够在不提高采样率和FFT的运算点数的情况下，极大地提高了测频精度；（2）异步采样率变换技术，该技术提出一种基于多相滤波器的简化算法：通过分析输出与输入、滤波器系数之间的关系，再结合抽样率转换的比值，仅对所需要留下来的点进行运算，以达到抽样率转换的目的，从而大大的降低了运算量；（3）在FPGA中设计FIR滤波器的分布式算法，该算法利用FPGA 查找表的能力，采用分布式算法，可以很大程度上提高信号的处理效率，从而在FPGA上实现能够滤除干扰信号的FIR滤波器；（4）基于m序列的伪随机码产生技术，该技术产生高斯白噪声，以使声靶发出类似船体的噪声。 |
| 英文摘要 | Acoustics target is the fixed device necessary for the test and authentication of torpedo acoustics fuze, and its main mission is to simulate the noise radiation characteristic and acoustics echo characteristic of the submarine ,to provide fixed target for the ocean test of the torpedo acoustics fuze，and to examine the tactics performance. The acoustics target in this task not only has the function to test torpedo acoustics fuze, but also has to combine with the torpedo homing target to test the function of torpedo acoustics fuze dynamically and real-time . The acoustics target integrates the function of acoustics fuze, acoustics homing and torpedo target test, and it can independently test the function of torpedo homing , and guide the torpedo to attack this acoustics target. While in the phase of the torpedo attacking， it transmits the torpedo acoustics fuze signal, and makes the torpedo act. It also can provide the underwater electronic modules of the part of the acoustics fuze and the part of the torpedo target test device into the underwater cabin of other sequential types of torpedo fixed target, to measure the torpedo acoustics fuze. The mission of this paper is to research the key technology of the signal processing in the acoustics target. The key technologies of the signal processing adopted here include : (1) the technology for accurately measuring frequencies on the basis of the method of ratio of frequencies , which can greatly improve the precision of the measured frequencies , without improving the sampling frequency andcount of FFT ; (2) asynchronous sampling frequency shifting technology , which brings forward a simplified method : it analyses the relation of the inputs ,the outputs and filter coefficients ,combines with the ratio of sampling frequency shifting , and only calculates the points needed to be reserved , to shift the sampling frequency, so the operation is greatly reduced; (3) the design of an FIR filter on FPGA on basis of the distributed arithmetic method, which uses the ability of look-up tables in the FPGA, adopts the distributed arithmetic method， and can greatly improve the processing efficiency of signal , to realize FIR filter which can filter interfered signals on the FPGA; (4) the produce of pseudorandom code on basis of the m sequence, which can produce Gauss noise, to make acoustics target to emit noise which is like the noise ships. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 72 |
| 源URL | [http://159.226.59.140/handle/311008/432]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 欧光艳. 声靶中的信号处理技术研究[D]. 声学研究所. 中国科学院声学研究所. 2008. |
入库方式： OAI收割
来源：声学研究所
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